Is the Damen Blue Line stop secretly Chicago's own Platform 9 ¾? Per a tweet from "Harry Potter" author J.K. Rowling on Wednesday morning, maybe!

Blue Line rider and Twitter user @mehow87 – display name Michal Wilczewski – posted a photo of a chalk-drawn door on the side of a brick building next to the Damen Blue Line stop, tweeting it at Rowling to ask, "@jk_rowling can you tell me more about this door to Hogwarts at the Damen Blue Line stop in Chicago?"

Ilvermorny is the North American school of witchcraft and wizardry from Rowling's magical Harry Potter universe. Or perhaps it's a real-life wizarding school that offers a magical portal here in Chicago for its exchange students heading to Europe. You decide, really.

But if you want to see the door for yourself, hit the Blue Line and depart at Damen.